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Response of Resistant and Susceptible Soybean Cultivars to Continuous Cropping in Area Infested with Cyst Nematode. E. E. Hartwig, Research Agronomist, U.S. Department of Agriculture, Agricultural Research Service, P.O. Box 196, Stoneville, MS 38776. J. M. Epps, Research Nematologist (retired), U.S. Department of Agriculture, Agricultural Research Service, Jackson, TN 38301; and N. Buehring, Associate Agronomist, Mississippi Agriculture and Forestry Experiment Station, Northeast Mississippi Branch, Verona 38879. Plant Dis. 66:18-20. Accepted for publication 24 April 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982. DOI: 10.1094/PD-66-18.

Soybean management studies were conducted on soil infested with soybean cyst nematode. The field was identified in 1972 as having a high population of soybean cyst nematodes and also severe potash deficiency. The field was used for evaluating soybean breeding material in 1973, 1974, and 1975. In 1976, a management study was initiated to measure the effects of soybean cyst nematodes on soybean productivity. A cultivar resistant to race 3, Centennial, and a susceptible cultivar, Tracy, were grown continuously with and without a nematicide. They were also grown in a sequence of 2 yr of Centennial and 1 yr of Tracy and in a blend of 80% Centennial and 20% Tracy. A breeding line resistant to races 1, 3, and 4 was also included. After 5 yr, no treatment was superior to growing the cultivar Centennial continuously. Use of a nematicide reduced numbers of soybean cyst nematodes but did not result in increased seed yields.